气候变化领域集成服务门户(CCPortal): Reversible Compaction in Sheared Granular Flows and Its Significance for Nonlocal Rheology

CCPortal

DOI	10.1029/2020GL087137
	Reversible Compaction in Sheared Granular Flows and Its Significance for Nonlocal Rheology
	Taylor S.E.; Brodsky E.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	Naturally occurring granular flows like landslides often have a gas-like rapidly moving layer immediately adjacent to a slower quasistatic layer. Determining the nature of coupling between these regimes is critical to capturing flow behavior. Using image analysis and a rheometer, we measure dilation, acoustic energy, and velocity profiles for quartz sand sheared in a geometry that imposes multiple flow regimes at once. We show that acoustic energy resulting from grain collisions in the fastest part of flow causes (a) weakening and compaction of the transitional regime layer between quasistatic and fast flow and (b) increasing slow flow via reduced friction. Thus, the volume of the entire shear zone is governed by competing effects of dilation near the boundary and compaction in the more distant transitional layer. This understanding of the partition of volume change across the shear layer can guide models of natural shear zones and interpretation of deposits. ©2020. The Authors.
英文关键词	Compaction; Confined flow; Granular materials; Acoustic energy; Competing effects; Grain collisions; Naturally occurring; Sheared granular flow; Transitional layers; Transitional regimes; Velocity profiles; Shear flow; acoustic method; compaction; dilation; friction; granular medium; image analysis; landslide; rheology; sand; transition zone; velocity profile
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170356
作者单位	Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Taylor S.E.,Brodsky E.E.. Reversible Compaction in Sheared Granular Flows and Its Significance for Nonlocal Rheology[J],2020,47(10).
APA	Taylor S.E.,&Brodsky E.E..(2020).Reversible Compaction in Sheared Granular Flows and Its Significance for Nonlocal Rheology.Geophysical Research Letters,47(10).
MLA	Taylor S.E.,et al."Reversible Compaction in Sheared Granular Flows and Its Significance for Nonlocal Rheology".Geophysical Research Letters 47.10(2020).